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Hou Y.,Key Laboratory of Insect Ecology in Fujian | Hou Y.,Fujian Agriculture and forestry University | Miao Y.,Key Laboratory of Insect Ecology in Fujian | Miao Y.,Fujian Agriculture and forestry University | And 2 more authors.
Annals of the Entomological Society of America | Year: 2014

The nipa palm hispid, Octodonta nipae (Maulik) (Coleoptera: Chrysomelidae), is considered to be the most important invasive pest of palms in southern China. To evaluate the differences in the damage potential of O. nipae on three different host palms, the daily feeding rates of O. nipae were studied based on the age-stage, two-sex life table theory. There were no significant differences in consumption rate during the first to third instar among palm species. However, O. nipae consumed a greater area on Chinese windmill palm Trachycarpus fortunei (Hooker) H. Wendland and Canary Island date palm Phoenix canariensis Chabaud leaves than on pygmy date palm Phoenix roebelenii O' Brien leaves. Females consumed more food than males on all three palms tested. The net consumption rates were 11,007.6, 8,998.0, and 5,773.5 square millimeters per individual for O. nipae reared on Chinese windmill palm, Canary Island date palm, and pygmy date palm, respectively. The host palm had a significant effect on consumption by both male and female O. nipae, and the damage potential was higher on Chinese windmill palm and Canary Island date palm. According to the finite consumption rate, O. nipae could cause more severe damage on Chinese windmill palm and Canary Island date palm than on pygmy date palm. These results provide the first assessment of leaf area consumed and the potential damage by O. nipae on three host palms. Population projections based on age-stage, two-sex life tables, and stage-specific consumption rates can reveal the stage structure and damage potential of the pest population. This approach offers a promising tool for quantitative assessment of the feeding capacity of this invasive beetle. © 2014 Entomological Society of America. Source


Hou Y.,Key Laboratory of Insect Ecology in Fujian | Hou Y.,Key Laboratory of Integrated Pest Management for Fujian Taiwan Crops | Miao Y.,Key Laboratory of Insect Ecology in Fujian | Miao Y.,Key Laboratory of Integrated Pest Management for Fujian Taiwan Crops | And 2 more authors.
Journal of Economic Entomology | Year: 2014

In southeastern China, the invasion of the nipa palm hispid Octodonta nipae (Maulik) (Coleoptera: Chrysomelidae) results in devastating damage to palms. Host plants play an important role in the population increases and outbreaks of O. nipae. O. nipae could not complete its development on the Majestic palm (Ravenea rivularis Jumelle & Perrier), and females did not lay eggs on Chinese fan palm (Livistona chinensis R. Brown). However, this insect species both completed development and laid eggs on Chinese windmill palm (Trachycarpus fortunei (Hooker) H. Wendland), Canary Island date palm (Phoenix canariensis Chabaud), and pygmy date palm (Phoenix roebelenii O' Brien). The demographic characteristics of O. nipae reared on Chinese windmill palm, Canary Island date palm, and pygmy date palm were compared with an age-stage, two-sex life table. In this study, the developmental periods from egg to adult varied from 42.1 d on Chinese windmill palm to 49.8 d on pygmy date palm. The survivorship from egg to adult on Chinese windmill palm, Canary Island date palm, and pygmy date palm was 77.5, 79.4, and 66.7%, respectively. Although the adult longevity and the mean fecundity for individuals reared on Chinese windmill palm, Canary Island date palm, and pygmy date palm were not significantly different, there were significant differences in the intrinsic rate of increase, the finite rate, and the mean generation time among palm species, and the values of intrinsic rate of increase and finite rate were higher for populations reared on Chinese windmill palm and Canary Island date palm (0.0313 and 1.0318 d-1 and 0.0278 and 1.0282 d-1, respectively) and lower for populations reared on pygmy date palm (0.0192 and 1.0194 d-1). However, mean generation time was shorter on Chinese windmill palm (124.11 d) and Canary Island date palm (129.62 d) and longer on pygmy date palm (166.03 d). Our study indicated that different hosts affected life parameters of O. nipae, with the most preferred hosts being the Chinese windmill palm and Canary Island date palm. These results may be useful for the design of culture management strategies for O. nipae. © 2014 Entomological Society of America. Source

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